Boring bar for use upon pipe coupling blanks or the like



De 13, 1932 w. G. BENNIGHOFF BORING BAR FOR US UPON PIPE COUPLING BLANKS OR THE LIKE Filed Nov. 8. 1930 3 Sheets-Sheet 1 De@ 13, 1932- w. G. BENNINGHOFF 1,890,452

v BORING BAR FOR USE UPON PIPE COUPLING BLANKS OR THE LIKE Filed Nov. 8. 1930 5 Sheets-Sheet 2 Dec. 13, 1932. w. G. BENNINGHOFF l1,890,452 l BORING BAR FOR USE UPON PIPE COUPLINGBLANKS OR, THE LIKE Filed Nov. 8. 1930 i 3 Sheets-Sheet 3 9% umuum fav;

lamin s 1| Hlm!" @ya u! A patented Dec. 13, Y

wif-mim e. iannnmenorr mvnnmb nmenraenm Y i BORING BAB. Fon USE Uronrier oourLIN'Gvv-:BLA'NKS:fonfrnn LIKE l 1 Appn'cation aieandvembrs, i930 seri9a1 no; alavesav Y c i vThe invention particularly relates to alborf ing-bar adapted for use inopposed axiallyaligned iifgglit-llaiidl and 'left-hand pairs which are mounted opposed cutting tools.V

@The inventionl isV vdesigned? particularly for working upon `they interior and endsoftubu-A lar blanks, such asftliose' intended for-piped couplings and the like. The Working? ends` ofthe toolsextend forwardly of the headsoi'v lgthe respective bars and overlap the ends of the respectively opposed tools, in order to complete the voperation uponl the blank which is being finished, Without creating, or leaving any bur or otheruntreated or blemisliedzsec-V 15.; tiongin thegcompleted blank. i Some of the im? proved `details o.1r the new boringfbar consist y inspeci-alsupports for the, extending cutting. ends of' the tools means for', making room` for the vmetall removed by the cutters, evenf 20though the tools are `used in opposed pairs;

in-atubular blank and theircutting ends overlap; and special means Sfor adjustingftlie cutting `tools and, permitting` convenient` lref placement thereof. Other l improvements 25,

ings.A

TheV annexed` drawings means constituting, however-fonly one of the various forms in-Which tlierprinciple of the -r Whiclitliesarie. -respective elements areindi#l Y' .c cated. by tlie -saine numbersIin the several Y vieW"s',`,IV show the-kshank-l of afboringbar 80 invent-ion may be embodied.

In said annexed drawings;

an opposed axially-alignedipair ofy the improved 4boring bars,.equipped with tools,

' shownzfor the purpose of-illustrationbeing a 'pipe coupling,blank;` A j 45V lFigure 2s4 a-longitudinal section-.of the Fj Willjhereina'fter appear `and be fully described l 4uponreference to the accompanyingt draw-1 ana al@ fuwig.

description set` forthI in detail certainmeans exemplifying my invention, suchl disclosed,

Figure l isan elevation `orfan'assembly ofgf barslioyvnin Figure" 1k, the section beinglt'alren in the planes'indicated E' gure is an elevation, 'partially broken avv'ay'and partiallyfinsection, of tlie pipeo cofuplingk blank, `Whicbfis shown las an illus-'1` tration ofthe form oiibl'a'nks `,upo'nfwhich tlie y improvedbar isadaptedtooperate; i v L v Y Figure 4 is` an yenlarged side elevation, "par` tially in sectionA and partially brol'renayvay, `55

of the right-hand boringba-r shown in Fig-c f wel i f.

Figii-reisa fragmentary longitudinal section .ofi a4 bofrlngV bai,y showing particularly.VV

the relative position therein `of a ce1`tai nre` 6oV cessingtooLandftlie manner of mounting and'l y adj ustingtbe saine g, l 'F'gurei'sfa fragmentary longitudinalsecc tion of'a boring bar, shoyving'fparticularly the v position therein of a certain f'acingand chamg` `65` Vtering, tooliandthe .manner of mountingandf adjLi-stingthesame;V Y y E'gii're a fragmentary axial section` tliiunigliV the,E axially-aligned boring bars, j n' slioyvfing the :position therein c 'of [certain bor- 70` ing, tools andthe manner of mounting and kadjusting',fthe same, this "view showing oneV complete bar and suggesting the opposed `bor-v ingtool' end of theother bar'; and

jFigure Slis anend elevationoi' one boringv'75Vv bar.

Referring, t the annexeddrav'vings, in.

adaptdto befposi-ti'oned' and securejdby a set screw. -3 in an adaptor@ mounted iin a sup? fragmentary portions of the respectivemain POIVH S'CIUCI 1- vP'OTOTL0f th Shik,

supporting structures-,being shown, partially` "insection, and the blank, upon whiclrthelborl ing'bars are `Workin g, being-1shovvnin vertical-I4 longitudinal section, !the particular blankyi,

4 is peripherally threaded'- forengagement" Withan adjustingvifing to abodypor- `8,5l tion 6iofztliebanadjacent the sli'ankl, is jse`-` Y from the face. of thefbody, andentende` Q99 feo for the 'cutting ends of lboring tools, Vas will be hereinafter fully described. Y

The boring bar body and pilot and adjusting rings, above-described, form mountngs Y j forfvarious cutting tools which'are positioned l andadjusted in the mannerA hereinafter fully described, it beingunderstood that thereare opposedy right-handV and left-hand boringy ybars and thatv thevblank 20:'is mounted aid-1VVV jacent to and surrounding the'opp'osed inner faces 10'of the two bars and operated upon j Vsimultaneously/at its twoends and interiorly.V

by tools vwhich areV mounted in themopposed bars. In theform ofrdevice illustrated in the accompanyingy drawings, I1 show toolsfor;

electing three operations: facingV and ehamfering; (2) recessing;YV and(3)1boring.` These tools .are all worked at thesame, time", v lditi'onQ'to the loperation' of the respective cuts so that the facingA andchamfering,,recessing,

' .and boring Eoperations are'fs'imultaneously effected. f

i Thepilot ring7 is' formed with recessesffl2l adapted to accommodate, andl permit the longitudinal adjustment of, facing andchamfering toolsl 11. These-tools 11 are three .in

v number, in the embodiment of the invention illustrated, but anyI suitable number may be Y used.v These toolsll cut the 'blanks tolength,

.andl round off and face'the blank ends. `The tools 11 are adjustedv by screws 13, Figure 6, and held'by set screws.; Recesses 25 are formed Yin the Yperipheral area `of the body `6 d and are adapted to accommodateirec'essing tools 14;, three in number, in theembodim'ent illustrated, but any suitablenumbermay-'be v used. vThese tools 141 are manually adjustable f and heldV inthe body 6 in adjusted'position 49 by'lset'screws 15 mountedfin thepilotring i 7 g `Intersec'tin, the face 10 ofthebody' inemf ber-6 vare grooves adaptedto accommodate? i boring blades 16, six -in''mimbenpin the ein-- l .bodimentillustrated, 'but any.' suitable numbermayb'e used. The boring blades 16 v:aref

held to adjustedposition Vby-'thljust bars 17,

' v j Vwhich passA through and are seatedin grooves y formed in a part of the body 6 and `"Contact` @at one end with the. rear lfaces of the boring "blades 16 and at'the otherV end lwith the adf L justing .ring k5.v This latterfring risof split c formation and' is locked in adjusted position Y uponthe threaded portion oftheshankll by :radial displacementby pairs offclamps"'18,V y d j tended throughithe body- '.member f and at oneff .i means of a`screw 22. The boringbladesll Y being Vformed with -lgrooves adapted' to.l acare frictionally held in their groovesl against heldin place by screws19," as clearly shown in Figures {l'and 8.V

TheV yinvention s 'designed ..be4 `operated i either, through `the rotatingfof. the boring bars, or the rotating ofthe coupling blank 20,

of the vropposed boring tools 16 overlap. Thev Y invention is designedso that 'the forwardvr v-edgeof a boring blades-hall fcome at leastfto the center ofV the'coupling 20 and, in fact,` the opposed boring'blades actually Overlap soV as to effect their 'Mbo-ring operation withoutA leaving anyyfins or other disadv'antageous'orV incompleteeflects `in the coupling, yFigure 3 n shows one of the coupling blanks and Figure 7 shows"thevcouplingiwhen the boringnbar v l Y operations; are' completed, the Acompleted 'Coupling of Figure 7 "requiring, kof course, ay f 'l ready j for use;` the apparatusfor effecting this ythreading operation, beingV however, 'not apart of this invention.

The construction described, and 'shown in 85,

the .aempnyng drawings; provides, in admetal removed centrally ofthe yopposec'ifface's" '10,of,thetwoboringbars; Thesupports for' d thecutting edges of the boring blades 16 arel` furnished bythe seats' or lugs "9 `which 'are varranged forwardly of the bar faces 10 and in ,spaced'relationrindany annular lring and tingtoolsfandjtheirrequired adjustmenufor t 'j l supporting, the extended' cutting :endsfofj they 'n Vboring blades 16 `and for making roomi fori providefa backing for the sidesfof the blades '5 lfop'posite the cutting facesas wellasforl`V i the bottom of the blades. rl`he space for'the Vmetal removedV is lprovided by therecesses 8 f whichare formed in the center ofthe 'bodies 'madjacentthefaces 10,'V vIfdirec't particular attention to the'V interspacingand `staggered arrangement of the various tools 16l andthe seats 9, 'clearly shown inthe end; eleva-tion Yof fragmentaryportion '21;of a supporting-fY structure Af orthe Vcoupling blank 20, as also,

fragmentaryportions 23 Vand 24 ofv support` ing structures for the 'pairf'of pilot rings-7, f areshown infFigure 1:j l-It-is assumed that?. desired 'and' suitable oil passages and grooves'v are provided inY the boring bars,`whose coni struction 4and functionsarej 'well-known toY commodate cutting, tools, 'adjusting` bars; eX,-

end abutting said adjusting ringfandjatthe oth-erend adapted toextendjinto said groove s,z- 125' 1 said body member bein-g also formed vvwith Isurface recesses adapted v:to accommodate f other cutting tools,,andmeanspositionedin 1 transverse alignment'` with*Ysaidsurface"relAV cesse's, for securing tools? in` said irecess'es. j s 'j ber, an adjusting ring movably longitudinally of and upon the body member, a pilot ring secured upon the body member,"said pilot ring being formed with recesses there`- through adapted to accommodatey cutting tools, adjusting screws'in said pilot ring extended into said recesses, means for holding said cutting tools, said body member being ring having threaded engagement-with said shank port1on,'a pilot ring secured upon the body member, said pilot ring being-formed first-mentioned grooves'for supporting radi# ally and laterally the forwardlyextendedy endsof thetools, said lugs being spaced apart f v and formed 4so that, when two similar boring.- f

bars are fed toward `leach other, the toolset," mounted thereonmayoverlap in spaced re-.v lation vwhereby the material removed by the overlappingY tools 'maypassjinto said central i recess.

Signed by me 1930,

with recesses adapted to accommodate cutting tools, ladjusting screws in said pilot ring extended into said recesses, said body meml I ber being formed with grooves adapted to accommodate a nsecond set of cutting tools, ad-

' justing bars extended through the body inem#V i ber'andV at one end abutting said adjusting ring and at the otherfend adapted to extend into said grooves, said body member `being e also formed with surface recesses adapted toaccommodate other cutting tools, and means on said pilot ring adapted to secure said lastmentioned tools in said surface recesses.

4. A boring bar comprising a body: member having anend face provided with a recess forming a storage chamber, means at the exterior longitudinal surface of said body member adapted to hold boring tools soas to extend outwardly from said surface in annular-vl ly spaced relation with respect to each other and so as to extend forwardlywith respect to said face, and annularly spaced means extending forwardly 'from said face in alignment with the iirst-'mentioned means and adapted to provide radial. and lateral sup#v i i port for the forwardly extending ends of the tools', Vthe second-mentioned means vbeing formed so that the tools supported thereby. may overlap, and be spaced'from, similar tools mounted on a similar b oring bar when the two boring bars are fed toward each other whereby the material removed by thek overlapping tools maypass into said recess.

5. A boring bar comprisinga body member having an end face provided with a central recess forminga storage chamber and, having longitudinall grooves in its exterior longitudinal surface, said grooves extendingl to said face and being adapted to accommodate boring tools in forwardly. extended re, lation with resp-ect to said face, means for securing `the boring tools in said grooves, and spaced lugs extending forwardly from said face and having lgrooves in alignment with raaf this dayr of November, WILLIAM G. BENNINGHOEE; 

